Three or more overlapping sealing members arranged circumferentially around a passage in a supporting body form an annular seal around a pipe inserted into the passage.

In one system, there is an emergency pipe stroker tool, wherein the emergency pipe stroker tool is configured to act as a first mechanical barrier for a well. Further, there is an emergency quick disconnect tool in communication with the emergency pipe stroker tool, wherein the emergency quick disconnect tool comprises a connector assembly and a fluid conduit in communication with the well, and further wherein the connector assembly is configured to simultaneously detach from the well and to seal the well. Further still, there is a cement retainer in communication with the emergency quick disconnect tool and the emergency pipe stroker tool, wherein the cement retainer is configured to act as a second mechanical barrier for the well, wherein, the emergency pipe stroker tool, the emergency quick disconnect tool, and the cement retainer act in coordination to seal a well while establishing the multiple mechanical barriers.

In one system, there is an emergency pipe stroker tool, wherein the emergency pipe stroker tool is configured to act as a first mechanical barrier for a well. Further, there is an emergency quick disconnect tool in communication with the emergency pipe stroker tool, wherein the emergency quick disconnect tool comprises a connector assembly and a fluid conduit in communication with the well, and further wherein the connector assembly is configured to simultaneously detach from the well and to seal the well. Further still, there is a cement retainer in communication with the emergency quick disconnect tool and the emergency pipe stroker tool, wherein the cement retainer is configured to act as a second mechanical barrier for the well, wherein, the emergency pipe stroker tool, the emergency quick disconnect tool, and the cement retainer act in coordination to seal a well while establishing the multiple mechanical barriers.

A system may include a seal including a seal body having an exterior with a seal interface. Additionally, the system may include a core disposed internally within and surrounded by the seal body. A gas permeability of the core may be less than a gas permeability of the seal body, a coefficient of thermal expansion of the core may be less than a coefficient of thermal expansion of the seal body, or a combination thereof.

A system may include a seal including a seal body having an exterior with a seal interface. Additionally, the system may include a core disposed internally within and surrounded by the seal body. A gas permeability of the core may be less than a gas permeability of the seal body, a coefficient of thermal expansion of the core may be less than a coefficient of thermal expansion of the seal body, or a combination thereof.

An apparatus for drilling a subterranean wellbore using a drill string. The apparatus includes a riser, a sealing device arranged in the riser so as to form a first riser chamber and a second riser chamber, and a riser booster pump. The riser at least partly contains the drill string and defines a substantially annular space around the drill string. The second chamber is in a fluid communication with the riser booster pump so that a kill fluid stored in the second riser chamber may be maintained at a first pressure which is greater than a second pressure of a drilling fluid in the first riser chamber.

An apparatus for drilling a subterranean wellbore using a drill string. The apparatus includes a riser, a sealing device arranged in the riser so as to form a first riser chamber and a second riser chamber, and a riser booster pump. The riser at least partly contains the drill string and defines a substantially annular space around the drill string. The second chamber is in a fluid communication with the riser booster pump so that a kill fluid stored in the second riser chamber may be maintained at a first pressure which is greater than a second pressure of a drilling fluid in the first riser chamber.

A method of using a water based solution having a controllable gel time. The method includes providing a predetermined ratio of a water soluble silicate solution having at least one alkali metal, providing a predetermined ratio of a water dispersible polymer, and providing a predetermined ratio of a water soluble initiator containing a reactive carbonyl compound. One embodiment of the method also includes combining the water soluble silicate solution, the dispersible polymer, and the water soluble initiator and injecting downhole in a single stage treatment. Another embodiment of the method includes pre-mixing at least the water soluble silicate solution and the dispersible polymer into a mixture, then injecting the water soluble initiator and the mixture downhole separately for a multi-stage treatment with in situ mixing.

A system may include a seal including a seal body having an exterior with a seal interface. Additionally, the system may include a core disposed internally within and surrounded by the seal body. A gas permeability of the core may be less than a gas permeability of the seal body, a coefficient of thermal expansion of the core may be less than a coefficient of thermal expansion of the seal body, or a combination thereof.

A mechanically extendable drilling stand configured to be installed on an in-ground drilling casing in conjunction with typical elements of the drilling stack and then extended using a height adjustment assembly to mate with a rotating head or flow nipple line at the drilling sub floor. The mechanically extendable drilling stand having an upper cylindrical conductor section configured to telescopically engage with a lower cylindrical conductor section and a sealing assembly formed between the conductor sections.